Career
Mahé owned a succession of stamp shops in Paris at Rue de Clichy, Rue de Chateaudon and Rue de Cannettes. One of his customers was Philipp von Ferrary who later employed Mahé as his private secretary and custodian of his stamp collection at his mansion in Rue de Varennes from 1874 until Mahé died in 1913. Pierre was also survived by a daughter.